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22.63 mpg as soon as i put in new plugs. then the next tank was 21.99 mpg just got new wires today, doubt i'll see a difference in mpg but i'll let the numbers talk for that.

okay i'll ask, what is a EGR pipe and where? I am a bit familar with areas in my car but havent learned that one yet.

same here I bought my 99' last summer and the code came up shortly after. The code is for the Secondary air injection incorrect flow or something. I looked up info on secondary air then determined that it wasnt an emergency. Mean while the engine light came on more frequently then finally its...

well for one thing that is maybe a bit counter intuitive but mustang specifically call for regular unleaded gas. I have always used 87 and I do a little under 300 to the tank and that was with bad plugs. I just changed them today and i'll calc that soon as the tanks empty.

A good example Hey guys. I had the exact same problem for some time and finally decided to do something about it. First I went to the shop to check the price for a full blown tune-up. Then I came here and read this thread. Luck me, I went straight to the parts store, got some plugs and presto...